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Old 05-29-2012, 05:03 PM   #1
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Can I have a slightly smaller spare tire?

This past Feb., I purchased my '05 Rubi that's my daily driver that I plan to keep close to stock. It's going to be time for new tires soon so one modest thing that I was planning was perhaps a 2" BB so that I could upgrade the 31s to 32s (probably Duratracs) and still use my Moab wheels.

So is it a bad idea to keep my original, smaller spare? So the size difference would be moving from a 245/75/16 to a 265/75/16. And if I do this should I limit how I use it, e.g., should I only put it on the front in 2wd and limp home, etc.? Or is the small size difference not a big deal? I wouldn't ever plan on running it on the highway, I just want to be able to get somewhere if I have a flat on the trail and not screw anything up.

Thanks for the advice!

Wes

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Old 05-29-2012, 05:11 PM   #2
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If the spare is original it is time to replace. That's 7 years. Tires have a shelf life. Last time i replaced tires i get 5 and talk my tire guy into giving me a $10 discount per tire ($50 all together). Does not hurt to ask. Then i do a5 tire rotation. Otherwise youare just wasting rubberand with5 tire rotation that is like extending 20% before next set of tires.

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Old 05-29-2012, 05:21 PM   #3
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You'll be fine driving home with that size difference (think donuts). I agree, the shelf life is starting to get a little on the older side.
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Old 05-29-2012, 05:36 PM   #4
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Because your Rubicon has a limited slip differential in the rear, I would not have a spare that was a different size. Or at least I would not install it on the rear axle if a rear tire went flat. You would have to move a front tire to that rear flat location and install the spare onto the front axle which does not have a limited slip differential.
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Old 05-29-2012, 06:37 PM   #5
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It's not going to hurt a limited slip. I have limited slip vehicles w/ doughnut (smaller size) spares and there is nothing in the owner's manual that says NOT to put it on the rear
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Old 05-29-2012, 07:14 PM   #6
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I thought about a 5 tire rotation with the spare. Do most of you do a 5 tire rotation? Is there a specific pattern that I need to know about?

Thanks!
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Old 05-29-2012, 07:28 PM   #7
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Donut tires are the same size as the normal tire that comes on the vehicle in the aspect of overall outside diameter. You never want to run two different size tires on the same axle. They would be rolling at different speeds and in a sense travel different distances. This can cause damage to the differential.
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Old 05-29-2012, 07:31 PM   #8
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My spare is OE. As long as the tire isn't badly weather checked, save your money and have fun
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Old 05-29-2012, 07:32 PM   #9
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Originally Posted by scooter87 View Post
Donut tires are the same size as the normal tire that comes on the vehicle in the aspect of overall outside diameter. You never want to run two different size tires on the same axle. They would be rolling at different speeds and in a sense travel different distances. This can cause damage to the differential.
Unless you locked it's not going to cause damage. The very purpose of your differential is to allow your tires to spin at different rates. If you have a clutch based limited slip the clutches are always going to be slipping and will wear them out faster. I'm not sure what it will do to a gear driven limited slip though.

Just do what Jerry said. If you have a rear flat tire move a front tire back and throw the spare onto the front axle which will be open.
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Old 05-29-2012, 09:45 PM   #10
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Donut tires are the same size as the normal tire that comes on the vehicle in the aspect of overall outside diameter. You never want to run two different size tires on the same axle. They would be rolling at different speeds and in a sense travel different distances. This can cause damage to the differential.
Not all of them. 1989 Mustang GT, factory limited slip and smaller diameter donut spaare. Owned the car since new and have had several rear flats.
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Old 05-30-2012, 12:21 PM   #11
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Why don't you just buy a used tire of the same dimensions? That way it will look less silly on the back and will be functional if you ever need to use it?
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Old 05-30-2012, 12:52 PM   #12
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Why don't you just buy a used tire of the same dimensions? That way it will look less silly on the back and will be functional if you ever need to use it?
Some prefer not to have that big ol tire back there blocking vision and adding weight to the stock hinges.
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Old 05-30-2012, 01:03 PM   #13
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Unless you are driving in a straight line, your tires are always going different speeds, anyway.

A smaller or older spare should get you home if it's 10-20 miles, but if you use it you should replace with a matching tire immediately. I'd also have AAA handy.

When I had a WJ I rotated a way-too-old spare into the rotation and it blew out within a month. I learned the lesson of old (expired) tires the hard way. But the point of a spare is to get you home, not to drive around town with.
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Old 05-30-2012, 01:20 PM   #14
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Some prefer not to have that big ol tire back there blocking vision and adding weight to the stock hinges.
Oh I know what you mean, I can barely see anything out my back window between that and the stock reverse lights I've thought about moving the spare inside.

I'm out in Gresham OR by the way!
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Old 05-30-2012, 01:33 PM   #15
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[QUOTE=Jerry Bransford;2415551]Because your Rubicon has a limited slip differential in the rear,

I did not think Rubicon's had limited slips, I thought they were selectable lockers front and rear?? Just asking
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Old 05-30-2012, 03:17 PM   #16
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I think that I'll keep the one that's on there. I don't know if it's original or not. The tread is great and I don't see any cracking. I'll put the money saved towards the road hazard for the other 4, and I've already got AAA Plus so that will tow me 100 miles if necessary. Another motivation is that I just put a hitch Thule rack on the back and it when I fold it up, it just clears the spare and folds up nicely without any added extension.

Thanks for the input! My plan will be if I get a flat to put the spare on the front and put the Jeep in 2wd.
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Old 05-30-2012, 04:50 PM   #17
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Originally Posted by scooter87 View Post
Donut tires are the same size as the normal tire that comes on the vehicle in the aspect of overall outside diameter. You never want to run two different size tires on the same axle. They would be rolling at different speeds and in a sense travel different distances. This can cause damage to the differential.
My Cougar's donut was smaller, and I know from the Civic I saw that it was smaller

Your differential is what compensates for running different speeds, just like making a turn or going off-road.
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Old 05-30-2012, 07:34 PM   #18
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I did not think Rubicon's had limited slips, I thought they were selectable lockers front and rear?? Just asking
Yes they have selectable lockers front and rear but the rear axle also includes a gear driven limited slip differential for when the rear locker is not actuated.

The problem with the rear axle's LSD is that it slightly weakens the rear locker so it tends to fail a bit more than it would without the LSD.
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Old 05-30-2012, 09:36 PM   #19
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My 5 tire rotation as follows:
Spare => driver side rear.
driver side rear => driver side front.
driver side front => passenger side rear.
passenger side rear => passenger side front.
Passenger side front =>spare.
nicething about 5 tire rotation is if you rotate your own tires you can do w/o using jackstands ora lift.
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Old 05-30-2012, 09:50 PM   #20
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Quote:
Originally Posted by wlindsey
This past Feb., I purchased my '05 Rubi that's my daily driver that I plan to keep close to stock. It's going to be time for new tires soon so one modest thing that I was planning was perhaps a 2" BB so that I could upgrade the 31s to 32s (probably Duratracs) and still use my Moab wheels.

So is it a bad idea to keep my original, smaller spare? So the size difference would be moving from a 245/75/16 to a 265/75/16. And if I do this should I limit how I use it, e.g., should I only put it on the front in 2wd and limp home, etc.? Or is the small size difference not a big deal? I wouldn't ever plan on running it on the highway, I just want to be able to get somewhere if I have a flat on the trail and not screw anything up.

Thanks for the advice!

Wes
You need all five tires to be the same size otherwise you will F up your differential when/if you get a flat
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Old 05-31-2012, 05:05 AM   #21
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You need all five tires to be the same size otherwise you will F up your differential when/if you get a flat
No you won't. Read the above regarding donut spares. Many are smaller that the normal tires.
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Old 05-31-2012, 09:16 AM   #22
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Neil, you're entitled to your opinion but so am I that running different diameter tires on a LSD-equipped axle causes additional unwanted wear in the LSD. Especially for the clutch-based Tracloc whose clutch pack wears out even without running different size tires.
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Old 05-31-2012, 09:24 AM   #23
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Running around for days/weeks at a time maybe but usage of a spare for what it is intended for is not going to cause undo wear i.e. more than normal driving.
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Old 05-31-2012, 09:42 AM   #24
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Running around for days/weeks at a time maybe but usage of a spare for what it is intended for is not going to cause undo wear i.e. more than normal driving.

How do you figure that? Ofcourse it will more than normal driving as the one wheel permanently turns faster than the other causing the limited slip differential to do what it is intended to do when your wheels spin and "limit the slip". The differential has no way of telling the difference between lack of traction and faster rotational speed because of outside diameter size.
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Old 05-31-2012, 09:42 AM   #25
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Neil, you're entitled to your opinion but so am I that running different diameter tires on a LSD-equipped axle causes additional unwanted wear in the LSD. Especially for the clutch-based Tracloc whose clutch pack wears out even without running different size tires.
In that case, mine must by toast. I have a Dana 35 rear with factory LSD and I blew a tire so am running my spare. One tire is 32.7" and the other is 30.5" or so from being so warn down. I have been this way for months
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Old 05-31-2012, 09:48 AM   #26
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In that case, mine must by toast. I have a Dana 35 rear with factory LSD and I blew a tire so am running my spare. One tire is 32.7" and the other is 30.5" or so from being so warn down. I have been this way for months
Don't worry it won't be the first non-functioning LSD
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Old 05-31-2012, 10:42 AM   #27
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How do you figure that? Ofcourse it will more than normal driving as the one wheel permanently turns faster than the other causing the limited slip differential to do what it is intended to do when your wheels spin and "limit the slip". The differential has no way of telling the difference between lack of traction and faster rotational speed because of outside diameter size.
Of couse it is going to cause SOME wear but it is not going to be distroyed after a minimal amount of time you actually used the spare.
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Old 05-31-2012, 11:47 AM   #28
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Originally Posted by wlindsey View Post
This past Feb., I purchased my '05 Rubi that's my daily driver that I plan to keep close to stock. It's going to be time for new tires soon so one modest thing that I was planning was perhaps a 2" BB so that I could upgrade the 31s to 32s (probably Duratracs) and still use my Moab wheels.

So is it a bad idea to keep my original, smaller spare? So the size difference would be moving from a 245/75/16 to a 265/75/16. And if I do this should I limit how I use it, e.g., should I only put it on the front in 2wd and limp home, etc.? Or is the small size difference not a big deal? I wouldn't ever plan on running it on the highway, I just want to be able to get somewhere if I have a flat on the trail and not screw anything up.

Thanks for the advice!

Wes
This thread is driving me nuts. So, going back to the OP...any spare (same size or smaller) is better than no spare. If the spare is smaller, then use it only long enough (asap)to get tire fixed/replaced.

There...close thread! lol
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Old 05-31-2012, 05:26 PM   #29
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Old 05-31-2012, 08:22 PM   #30
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Originally Posted by Dextreme

This thread is driving me nuts. So, going back to the OP...any spare (same size or smaller) is better than no spare. If the spare is smaller, then use it only long enough (asap)to get tire fixed/replaced.

There...close thread! lol
Never ever run a different sized spare on a rubi, and yes, you're better off with no spare than to fix the damage that might be done to your rear end for only a few miles of different sized tires.. If bucks are tight, as they were for me years ago, go and buy a used tire of the same size for your spare..

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